staging/rdma/hfi1: Thread the receive interrupt.
When under heavy load, the receive interrupt handler can run too long with IRQs
disabled. Add a mixed-mode threading scheme. Initially process packets in the
handler for quick responses (latency). If there are too many packets to
process move to a thread to continue (bandwidth).
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/rdma/hfi1/hfi.h b/drivers/staging/rdma/hfi1/hfi.h
index a35213e..190f7a2 100644
--- a/drivers/staging/rdma/hfi1/hfi.h
+++ b/drivers/staging/rdma/hfi1/hfi.h
@@ -313,7 +313,7 @@
* be valid. Worst case is we process an extra interrupt and up to 64
* packets with the wrong interrupt handler.
*/
- void (*do_interrupt)(struct hfi1_ctxtdata *rcd);
+ int (*do_interrupt)(struct hfi1_ctxtdata *rcd, int threaded);
};
/*
@@ -1130,9 +1130,21 @@
struct hfi1_devdata *, u8, u8);
void hfi1_free_ctxtdata(struct hfi1_devdata *, struct hfi1_ctxtdata *);
-void handle_receive_interrupt(struct hfi1_ctxtdata *);
-void handle_receive_interrupt_nodma_rtail(struct hfi1_ctxtdata *rcd);
-void handle_receive_interrupt_dma_rtail(struct hfi1_ctxtdata *rcd);
+int handle_receive_interrupt(struct hfi1_ctxtdata *, int);
+int handle_receive_interrupt_nodma_rtail(struct hfi1_ctxtdata *, int);
+int handle_receive_interrupt_dma_rtail(struct hfi1_ctxtdata *, int);
+
+/* receive packet handler dispositions */
+#define RCV_PKT_OK 0x0 /* keep going */
+#define RCV_PKT_LIMIT 0x1 /* stop, hit limit, start thread */
+#define RCV_PKT_DONE 0x2 /* stop, no more packets detected */
+
+/* calculate the current RHF address */
+static inline __le32 *get_rhf_addr(struct hfi1_ctxtdata *rcd)
+{
+ return (__le32 *)rcd->rcvhdrq + rcd->head + rcd->dd->rhf_offset;
+}
+
int hfi1_reset_device(int);
/* return the driver's idea of the logical OPA port state */